How do I find issues in which the comments do not contain a specific string

[Edward Dalton]

I already tried this:

comment !~ "Ignore issue" AND status not in (closed, resolved)

but "!~" doesn't work as I'd like.

[Jack Brickey]

see if this document helps you - advanced-searching-fields-reference

[Alexander Bondarev]

Hi! 

Can you describe you case a bit more? What exactly do you want to find?